Jim Campbell, Electrical Engineer Turned Artist, Lights Up San Francisco’s Salesforce Tower

Salesforce Tower, the new skyscraper dominating San Francisco's skyline, lit up for the first time in April. That first show was just a test, but now, every night starting at dusk, silhouettes of dancers and other images move against a bright background across the façade of the top six floors of the 62-story building. The show is called "Day for Night," and it goes on until 2 a.m.